Species Range: Known from Crack House Cave, Nahoch Nah Chich and Cenote Mayan Blue, both in Quintana Roo, Mexico.

Closest Related Species:Calliasmata bears a superficial resemblance to the genus Yagerocaris, represented by one species from Cozumel, Mexico. Within the genus, it closely resembles C. rimolii Chace, 1975.

Evolutionary Origins: This shrimp may have invaded crevicular and anchialine habitats in the Jurassic, which severed as refugia for the ancestors of the species during the Mesozoic. The species could have arisen from marine epigean progenitors rather than sharing common subterranean precursors. The wide distribution of the anchialine genus Calliasmata poses puzzling questions concerning its biogeography that may need to be supported by information on other co-occurring stygobitic Crustacea.

Conservation Status: Restricted to two anchialine caves along the Caribbean coast of the Yucatan Peninsula. Its Hawaiian congener C. pholidota has a global rank for extinction of G2: Imperiled globally because of factors making them very vulnerable to extinction range-wide. The criteria for this rank are: 6 - 20 occurrences or 1000 - 3000 individuals remaining. The State Rank (within Hawaii) is S1.2: 2 - 5 viable examples known.